SOS
noun
1
                    
                                          
              
          
                                                      : an internationally recognized signal of distress in radio code ‧ ‧ ‧ - - - ‧ ‧ ‧ used especially by ships calling for help                                      
                
                    
2
                    
                                          
              
          
                                                      : a call or request for help or rescue                                      
                
                    
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  Merriam-Webster unabridged




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